(jruby) Node#content= incompatibility

[flavorjones]

From https://groups.google.com/d/msg/nokogiri-talk/-/cGJk1BBRXygJ

Using Nokogiri 1.5.6:

#! /usr/bin/env ruby

require 'nokogiri'

d1=Nokogiri::XML('<r><a>text</a></r>')
d2=Nokogiri::XML('<r></r>')
ne=d1.root.xpath('//a').first.dup(1)
ne.content += "& < & > \" &"
d2.root << ne
puts d2.to_s

On MRI 1.9.3, output is:

<?xml version="1.0"?>
<r>
  <a>text&amp; &lt; &amp; &gt; " &amp;</a>
</r>

On JRuby 1.7.1, output is:

<?xml version="1.0"?>
<r><a>text&amp;amp; &amp;lt; &amp;amp; &amp;gt; " &amp;amp;</a></r>

Note the double-escaping on JRuby.

[benlangfeld]

This is similar to #794. This may give a guide to the appropriate fix.